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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Treasury Stock
Retained Earnings
Balances at Jun. 30, 2014 $ 335,264 $ 88 $ 145,872 $ (123,864) $ 313,168
Balances (in shares) at Jun. 30, 2014   88,179,448   (44,238,960)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income and comprehensive income 129,663       129,663
Stock options exercised $ 1,686 $ 0 1,686    
Stock options exercised (in shares) 299,034 299,034      
Restricted stock units issued, net of tax withholdings $ (1,798)   (1,798)    
Restricted stock units issued, net of tax withholdings (in shares)   130,792      
Retirement of treasury shares 0   (138,864) $ 138,864  
Retirement of treasury shares (in shares)   0   44,768,739  
Cash dividend to common stock (in dollars per share) (15,020)       (15,020)
Repurchases of Common Stock (34,712) $ (1) (13,967) $ (15,000) (5,744)
Repurchase of common stock (in shares)   (1,195,497)   (529,779)  
Stock-based compensation expense 4,992   4,992    
Tax impact of employee stock transactions 2,079   2,079    
Balances at Jun. 30, 2015 422,154 $ 87 0 $ 0 422,067
Balances (in shares) at Jun. 30, 2015   87,413,777   0  
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income and comprehensive income 213,616       213,616
Stock options exercised $ 1,106   1,106    
Stock options exercised (in shares) 171,263 171,263      
Restricted stock units issued, net of tax withholdings $ (1,223)   (1,223)    
Restricted stock units issued, net of tax withholdings (in shares)   104,436      
Repurchases of Common Stock (200,000) $ (6) (4,606) $ 0 (195,388)
Repurchase of common stock (in shares)   (6,022,347)   0  
Stock-based compensation expense 3,719   3,719    
Tax impact of employee stock transactions 1,004   1,004    
Balances at Jun. 30, 2016 440,376 $ 82 0 $ 0 440,294
Balances (in shares) at Jun. 30, 2016   81,667,129   0  
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income and comprehensive income 257,506       257,506
Stock options exercised $ 1,436   1,436    
Stock options exercised (in shares) 502,350 502,350      
Restricted stock units issued, net of tax withholdings $ (1,594)   (1,594)    
Restricted stock units issued, net of tax withholdings (in shares)   88,897      
Repurchases of Common Stock (98,745) $ (2) (2,102)   (96,641)
Repurchase of common stock (in shares)   (1,982,411)      
Stock-based compensation expense 2,785   2,785   0
Balances at Jun. 30, 2017 $ 601,764 $ 80 $ 525 $ 0 $ 601,159
Balances (in shares) at Jun. 30, 2017   80,275,965   0